Caen VX1290A TDC adjustment
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To achieve 25ps bin with 100ps clock, a signal is split into 4 different RC circuits. Value of C is adjustable with four 3-bit calibration constants. The goal is to have a change in a least-significant bit of time measurement for a random signal to occur with the same probability in all 4 channels. |
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A) A measurement of TDC bin size was done with a signal
delayed by 200ns. Before adjustment, the bin size was
measured to be 24.86ps. After adjustment, it became 25.11ps
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B) Timing resolution was measured by the width of time difference
between 2 signlas from TI unit. It was 39.5ps before and 35.1ps
after adjustment. Similar measurement for F1TDC gave 49ps resolution.
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